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that herd of cows and calves is the healthiest the

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that herd of cows and calves is the healthiest the
farm has has in some time.这句话应该怎么理解?最好是有句子成分分析,
发错了是 has had.我比较困惑的是,前面有个is,后面为什么还有个has....
that herd of cows and calves is the healthiest the
那群牛羊是那个农场一段时间以来所有的最健康的了
主干结构就是:that herd of cows and calves is the healthiest
后面是一个定语从句:the farm has had in some time使用了现在完成时态
补充:前面是句子的系动词,是主干结构,后面的是从句里面的谓语动词